Primary winding is the main conductor in current transformers that carries the measured current and induces proportional current in the secondary winding.
The primary winding or conductor in a current transformer is the essential component through which the current to be measured flows. It consists of one or more turns of conductive material, typically copper or aluminum, wound around a magnetic core. When alternating current passes through the primary winding, it creates a magnetic flux in the core, which induces a proportional current in the secondary winding according to the transformer's turns ratio. This component must handle the full load current of the system being monitored while maintaining accurate current transformation with minimal losses.
诱因 → 失效模式 → 工程缓解
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Single-turn primary windings consist of a straight conductor passing through the transformer core, used for high current applications. Multi-turn primary windings have multiple turns around the core, providing better accuracy for lower current measurements and allowing for different turns ratios.
Copper provides better conductivity and thermal performance but is more expensive. Aluminum is lighter and more cost-effective but has higher resistance. Material choice affects temperature rise, losses, and long-term reliability of the current transformer.
Common failures include insulation breakdown due to thermal aging or voltage stress, conductor overheating from excessive current, mechanical damage from vibration or improper installation, and corrosion of conductor material in harsh environments.
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